Assighob to the tillotson manufacturing



Nov. 26, 1929. G, F. RITTER 1,737,095

CARBURE T OR Filed. May 17 .v 1920 3 Sheets-Sheet l IN VEN TOR. Geol" Q Ri HQI? Nov. 26, 1929. G. F. RITTER 1,737,095

CARBURETOR Filed May 17. 1920 5 sheets-sheet 2 ll l p I z- 0 4 s y l l |y @i "f if 7 r k -f .i ,El

L-JII INVENTOR. Geol" e ITL/91 I l f I l' 'I j W ATTORNEY Nov. 26, 1929. G, F, RITTER 1,737,095

CAHBURETOR Filed May 17. 1920 's sheets-Sheet 3 /f/f//Q o 4 5 I i 5 a 1 .7 52- q ll Z, c a l l Y' Y 6 l/ Wu a 1 /4 G a f l., al

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INI/E NTOR.

Georg@ F R1 #er WM Patented Nov. 26, 1929 Unirse stares eArsNr OFFICE GEORGE E. RITTER, OE TOLEDO, Omo, Assrenon To THE TILLOTsON MANUFACTURING COMPANY, or ToLEno, omo, A CORPORATION OE OHIO CARBURETOR Application filed May 17, 1920. Serial No. 382,008.

The present invention relates to carburetorsv and has for its object to provide improved means for regulating and controlling the mixture under certain predetermined conditions of service whereby the proportionate amounts of air and fuel may be automatically regulated according to the speed of the engine, With other improvements for taking care of changing conditions and requirements in the use of the carburetor to insure its adaptability for different types of engines. y

A further object of the invention is to provide a carburetor having a plurality of air and fuel inlet passageivays leading to the mixing chamber With improved means for controlling said passagevvays to regulate the proportionate amounts of air and fuel to be supplied to the mixingchamber.

A further object of the invention is to provide a plurality of improved air inlet valves arranged to be opened progressively as the speed of the engine is increased with one or more of said valves constructed to permit the passage of fuel therethrough under lcertain predetermined conditions of service.

Another object ofthe invention is to `provide improved means for automatically cutting off the supply of fuelto the carburetor boivl When the fuel thereinreaches a predetermined level.

Another object of the invention is to provide a carburetor bowl having a cover upon which the entire mechanism for controlling the fuel supply is mounted so that the cover and mechanism thereon may be removed as a unit.

Still another object of the invention is to provide an extremely simple carburetor' of comparatively few parts constructed in such a manner as to require a minimum amount of machine Work and capable of being quickly assembled and adjusted whereby the cost of manufacture is reduced to the minimum.

To these and other ends the invention comprises certain novel features of construction and arrangement of parts which Will be hereinafter more fully pointed out and claimed, it being understood that the invention is susceptible to various modifications in the de- .ailed forms of construction Without departing from the scope of the invention as eX- pressed in the claims. y

In carrying out my invention, one embodiment thereof is illustrated in the accompanying drawings in which:

Figure I is an elevation partly in section illustrating one form of the invention.

Figure II is a sectional plan taken on line II-II of Figure I.`

Figure III is atransverse sectional elevation of a slightly modified form of carburetor taken on lines IIIMIII of Figure IV.

Figure IV is a side elevation partly in section illustrating the air inlet valves of the modified form of carburetor in open position. l

Figure V is a transverse sectional elevation taken on lines V-V of Figure IV.

Figure VI is a plan vieiv of the carburetor shown in Figure IV.

Figure VII is a sectional elevation taken on lines VII- VII of Figure VI.

Figure VIII is a sectional plan taken on lines VIIIe-VIII of Figure IV.

Like reference characters through-out the several figures of the drawings indicate corresponding parts.

The present invention embodies a carbu retor designed for use on both high and lovv speed engines and is constructed in a manner to provide for a comparatively rich mixture when the engine is starting or running at `loiv speed but which is automatic or self regulating to supply a relatively lean miX- ture When the engine is ruiming at high speed. rIhis is accomplished by a system of valves of different Weights which are progressively opened after the engine reaches a predetermined speed and continues to increase to mint approaching the maximum, at which time all of the air inlet valves may be opened, depending upon the number rovided and the Weight of the same. In a dition to the main fuel nozzle, an auxiliary supply nozzle is providedl which is adapted to discharge through one of the progressively opened valves for admitting auxiliary air to the carburetor whereby the demands of kie the engine for additional fuel at high speeds may be satisfied.

Referring to the drawings, a carburetor is provided having upper and lower carbureting and air inlet sections and 11 respectively, with a partition 12 disposed between the sections and secured by means of bolts 13 extending through the partition and the flanges of the upper and lower sections as shown at the left of Figure I. Section 11 is constructed to form an air supply chamber 14, while section 10 is provided with a mixing chamber 15 communicating with a vacuum chamber 16 at the top of the parti* tion which is formed by the lower enlarged portion 17 of the carbureting section. The carburetingfsection 10 which is adapted for communication with the intake manifold of the engine (not shown) is provided with the usual butterfly lvalve 18 for regulating the supply of fuel to be yfed to the engine. The partition 12 is provided with a Venturi tube having an upper portion 19 extending into the mixing chamber 15 and a lower portion 20 projecting into the air supply chamber 14 to which air is supplied through the open- 21 leading into the chamber 14 from one side thereof. Projecting into the Venturi 'tube in Figure I is a main fuel nozzle 22 to which fuel is supplied through the passageway 23 leading vto the carburetor bowl 24 vwhich is provided with a removable head or cover 25 through which the fuel is fed 'to the bowl from a suitable supply source (not shown). The fuel noz'zle 22 is provided with a needle valve 26 adjustable by means of an operatin member 27 which is threaded into a nut 23, the nut being threaded into the boss 29 o'n the bottom section 11 of the-carburetor. A packing nut 3() surrounds the stem or operating member 27 of the' needle valve to prevent leakage of fuel from the carburetor. The partition 12 is provided with a plurality of auxiliary air inlet openings `preferably three in number, two of which arellccated at one side ofthe Venturi tube 'and one at the opposite side as shown in Figure Il. The'aiixiliary air inlet openings in the partition V12 are normally covered by the valves 31, 32-and 33 which are adapted `to open preferably in the order named when la partial vvacuum is formed in the chamber 16 and 'when the engine is operating between "certain predetermined rates of speed. The ai-r inlet valves are provided with stems 34 Vmovable in guideways 35 formed in the outer wall ofthe carbureting section 10 whereby the proper seating of the valves is insured when ie't'uriiing to normal position. Ben'eath 'one ofthe valves and'preferably the one designed to open first, is positioned an auxiliary fuel nozzle 36 communicating with the fuel passageway 23 leading to the bowl v24. The nozzle 36 is rendered accessible by means of fa removable screw plug 37 as shown in Figure I. The auxiliary fuel nozzle is adapted to discharge through the vacuum chamber 16 into the mixing chamber 15 when the engine is running at high speed with the valve 31 in open position, but as soon as the speed decreases to a predetermined point and the vacuum in the chamber 16 is reduced, the valve 31 will automatically close and fuel will thereafter cease Ato Iflow through the nozzle 36. The valves 32 and 33 being somewhat heavier than the valve 31 will, of course, not open at the same time as the valve 31, but only after the speed of the engine has increased sulliciently to reduce the pressure in the suction 'chamber 16 below certain pren determined points.

In the modification shown in Figures HI to VIH linclusive the main `fuel nozzle 38 andthe auxiliary fuel nozzle y39 are slightly different in construction jfrom the nozzle shown in Figure I,-these nozzles being withn out .needle valves, but provided instead with removable .feed plugs 40, the fuel inlet openings of which may be drilled t'o any desired size according tothe requirements of the engine to which the carburetor is connected. The feed plugs 40 and nozzles 38 and 39 -are rendered accessible through openings in the bottom of the carburetor wall which are normally closed by means oft-he removablescrew plugs 41. The air inlet valves in this modilication are slightly different in construction from the valves 'shown -in Figure I. These valves are yindicated by the numerals 42, 43

and 44 which open preferably in the order f .l

named as vthe Yspeed of the engine continues to increase 'after reaching a predetermined rate. The valves 42 and 44 are'provid'ed with stems 45 and 46 respectively whichare guided inopenings formed in the wall of the carburetor as shown in Figure III. The valve 43 is provided with a hollow stem 47 guided in a by-pass 48 leading 'from ithe vacuum chamber 16 through l"the valve and stem and communicating with "the mixing chamber 15 .-1

through an aperture '49, andalso through aseries of apertures when the fthrot'tle valve is slightly opened 'as shown :by dotted lines in Figure VH. When l'the throttle is substantially closed,'as when the engine is idling, L.-

and only a smallquan'tity "of lfuel and air is being `drawn through -the Venturi tube, it is considered advisable to admit additional air to the carburetor, 'which is admitted through the by--p'ass'andfaper-ture 49, vthe additional air being admitted yto the intake manifold at a point above the butterily valve, whereby 'the vacuum 'in the carbu-reting section is broken Vand 'at'the same vtime-a :leaner mixture is afforded than would 'otherwise be valve to permit fuel to pass the throttle and keep the engine ruiming. As the atmospheric conditions vary from time to time, it has been found-advisable to provide the lower apertures for supplying additional air to the carbureting chamber when the throttle is slightly opened as indicated by dotted lines in Figure VII, and at such times as it is desired to increase the supply of air to the engine under different running conditions. It will be understood, however, that when the throttle valve is open, as under normal running conditions, that the apertures 49 and 50 have substantially no elliect upon the operai tion of the carburetor for the reason that they are extremely small in diameter and do not therefore have any appreciable effect when the engine is running at high speed. In the modified form of carburetor, it is preferable to have the auxiliary fuel nozzle positioned under the second auxiliary air inlet valve to open rather than under the first, as in the structure shown in Figure I. In this modilication, additional air may be admitted to the mixing chamber before the auxiliary fuel nozzle becomes effective, which may be desirable under certain climatic conditions. It will be understood,of course, that as soon as the valves 3l and are opened, fuel will flow from the auxiliary fuel nozzles 36 and 39 respectively around the Venturi tube into the mixing chamber of the carbureting section, and as the speed of the engine is decreased below a predetermined point, said valves will Q be automatically closed by the action of gravity.

In the construction of the bowl, I have preferably shown this as being integrally con nected with the main body of the carburetor, but it will be understood that this bowl may be cast separately if desired, and connected with the body by any suitable means. The head or cover 25 of the bowl is provided with a fuel receiving chamber 5l into which fuel is discharged through the connection 52. Extending upwardly through the lower wall of the cover and through the fuel chamber 5l is a post 53 which is threadedv at its `upper end into a removable cap 54 carried by the cover as shown in Figure VII, whereby the post is clamped upon the cover. The post, at the point where it passes through the fuel chamber 5l, is provided with a strainer 55 surrounding an annular recess 56 in the post, which communicates with the radial openings 57 in communication with the longitudinal opening 58 extending downwardly through the post and communicating with the fuel chamber of the bowl. The diameter of the strainer is less than the diamn eter of the largest portion of the post, to permit the post to be withdrawn from the cover without lirst requiring the removal of the strainer. `Positioned within the longitudinal opening 58 of the post is a fuel valve 59 which is preferably beveled at its upper end to more effectivelyclose the fuel inlet opening leading to the bowl. Extending downwardly from the cover is a lug or projection 60 upon which is pivoted at 61 a lever 62 connected at its inner end with a float provided with voutwardly struck tongues 69l to receive the pivot pins 61 and 67 respectively upon which said levers are mounted, the ends of the pins being anchored in their respective lugsy` between which the levers arek disposed. The head or cover 25 is provided with an aperture therethrough as indicated at 70, whereby the fuel in the bowl is at all times subjected to atmospheric pressure. A drain plug 7l is screwed into the bottom of the bowl to permit the same to bedrained from time to time. The compound system of levers controlled by the lioat forms a very satisfactory means for actuating the fuel inlet valve 59 and permits the valve to ride freely upon the lever 68 as the float moves up and down in the bowl, whereby the proper seating of the valve without binding is assured under all conditions of service.

In all the various modifications described, there is a single main intake port 21, the various internal auxiliary air valves and ports being a part of the original air circuit. This arrangement tends to maintain uniformityof air ow about the base of the main fuel nozzle 22 or 38 and operates to permit easier control of the temperature of the incoming air currents as well as easier lcontrol of the temperature of the fuel nozzle, an important factor in cold weather.

While I have described my invention more or less in detail, it will be understood that I do not wish to be limited by the specific f a vacuum chamber in the lower end thereof,

a partition disposed between said sections having an air inlet opening therethrough, a Venturi tube carried by said partition and arranged to project into said carbureting section, a fuel nozzle adapted to supply fuel .nino

to :said carbureting'section, a `bypass, a valve vfor said lair .inlet opening Yprovided with a hollowstem projecting into said by-pass, the latter .discharging into said carbureting section whereby communication is established between said air inlet section and said carbureting section,.sa-id valve being adapted to open :automatically when `the ypressure in said vacuum chamber is'reducedbelow a predetermined point.

2. ln a carburetor, the combination of an air inletsection, a carbureting section having a vacuum chamber inthe lower end thereof, a partition disposed between said sections having an air inlet opening therethrough, a Venturi tube carried by said partition and arranged to project into said carbureting section, :a fuel nozzle adapted to supply fuel to said Vcarl'mret-ing section, a by-pas's, a valve for said air inlet opening provided with a hollow :stem projecting into said by-pass,

the latter discharginginto said carbureting.

section whereby communication is established between said a-ir inlet section and said carbureting section, said valve being adapted to open automatically when the pressure in said vacuum chamber is reduced below a predetermined point, and a fuel nozzle adapted to discharge through said valve controlled opening.

3. In a carburetor, the combination of an Y air inlet section, a carbureting section, a partition disposed between ksaid sections and- -provided with an auxiliary air inlet opening, .meansfor supplying fuel to said carbureting section, a restricted bypass, a valve for said auxiliary air inlet opening arranged to normally establish communication between said .sections .through said yrestricted by-pass, fthe latter discharging into the carbureti'ng section .at a ypointabove that at which the fuel is admitted, said valve being automatically raised whenV the pressure above the same is decreased below a predetermined -point whereby auxiliary air is admitted directly to said carbureting section below the fuel admission point.

4. In a carburetor, the combination of an air inlet section, a cai-bursting section, a partition disposed between said sections and l; rovided with an auxiliar air inlet o eninfl means for supplying fuel to said carbureting section, a .restricted by-pass, a valve for said auxiliary air inlet opening arranged to normally establish communication between said sections through said restricted b-y-pass, the latter discharging into the carbureting section at a point above that at which the fuel is admitted, said valve being automatically vraised when the pressure above the same is decreased below a predetermined point, and a fuel nozzle adapted to discharge through Ysaid auxiliary' air inlet opening when valve is raised.

5. .Ina carburetor, the combination of an air inlet section, :a carbureting section, partition disposed between'said sections :provided with a plurality of auxiliary air inlet openings, means for supplying .fuel `to said carbureting section, a Arestricted byepa-ss, valves of different weights normally Iclosing said auxiliary air inlet openings, Vone of said valves being provided with a passageway normally communicating with saidrestricted bypass, :the latter leading into said carbureting section .above the fuel admission point, said valves being adapted to 'open progressively under different degrees of suction.r

6. In a carburetor, the combinationof an air inlet section, a carbureting section, a partition disposed Vbetween said sections, provided with -a plurality of auxiliary ai-r inlet openings, means for supply-ing fuel yto said carbureting section, a restricted by-pass, valves of different weights normally closing said auxiliary air inlet openings,one of said valves being provided with a passageway normally commui-iicatingwith said restricted 1oy-pass, theV latter leading into said carbureting section above the fuel admission point, said valves being adapted to open progressively under dierent degrees of suction, and a fuel nozzle Yadapted to discharge through one of saidopen-ings.

ln testimony whereof, I affix my signature.

GEORGE F. RITTER. 

